diff options
| -rw-r--r-- | src/include/stddef.h | 8 | ||||
| -rw-r--r-- | src/lib/program.ld | 4 |
2 files changed, 12 insertions, 0 deletions
diff --git a/src/include/stddef.h b/src/include/stddef.h index b58f645a3b..35326ed6c6 100644 --- a/src/include/stddef.h +++ b/src/include/stddef.h @@ -34,4 +34,12 @@ typedef unsigned int wint_t; #define MAYBE_STATIC static #endif +#ifndef __ROMCC__ +/* Provide a pointer to address 0 that thwarts any "accessing this is + * undefined behaviour and do whatever" trickery in compilers. + * Use when you _really_ need to read32(zeroptr) (ie. read address 0). + */ +extern void *zeroptr; +#endif + #endif /* STDDEF_H */ diff --git a/src/lib/program.ld b/src/lib/program.ld index 865b5f6aa7..9b8c7c9ec1 100644 --- a/src/lib/program.ld +++ b/src/lib/program.ld @@ -133,6 +133,10 @@ _eprogram = .; /* Discard the sections we don't need/want */ +.zeroptr 0 (NOLOAD) : { + zeroptr = .; +} + /DISCARD/ : { *(.comment) *(.comment.*) |